A coil of tangent galvanometer having diameter 16 cm is set up in magnetic meridian. When current of 0.8 A is passed through the coil, the magnetic needle is deflected through 45°. Find the length of the wire in the coil. Also find the reduction factor of tangent galvanometer. (Bí = 2 × 10* Wb/m², µo = 47 x 10-7 Wb/Am).
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